Electrical heater for coffee urns



Patent d-Oct 30,";51923. UNITED STATES I 1,472,201 PATENT OFFICE.

JAMES C. WOODSON, OF MANSFIELD, OHIO, ASSIGNOR TO WESTINGHOUSE ELECTRIC PRODUCTS COMPANY, A CORPORATION OF MICHIGAN.

ELECTRICAL HEATER FOR COFFEE URNS.

Application filed October 20, 1921. Serial 1T0, 509,129.

To all whom it may concern:

Be it known that 1, JAMES C. WOODSON, a citizen of the United States, and a resident of Mansfield, in the county of Richland and State of Ohio, have invented a new and useful Improvement in Electrical Heaters for Coffee Urns, of which the following is a specification. W My invention relates to electrically heated apparatus and particularly to electric liquid heaters and it has for its object to provide anadjustable electric heating unit for coffee urns.

In practising my invention, I provide a refractory plate having spiral grooves in its upper surface in which is located a helical resistor. A supporting member having a concave upper surface has a heat-insulating member located in the concave face and a concave reflector located'on said heat-insulating member, and is provided with means for securing the refractory plate against the concave surface of'the reflector. The supporting member is provided with avertically adjustable mounting on a base.

The single figure of the drawing is a view,

in vertical cross section, of a heating unit.

embodying myinvention.

A refractory plate 10 whichmay be of an suitable or desired contour but which wil usually be substantially circular, is provided, in its upper surface, with a plurality of substantially spiral grooves 11. A resistor'member'12, preferably formed of a resistor wire wound into a helix, is located in the grooves 11 which are of such form, in lateral cross section, as to permit of suitably retaining the resistor 12 therein.

A supporting member 13, having substantially the, same contour as the plate-10, is provided with a concave upper surface, in which is located a plate 14 of a suitable heat-insulating material, such as asbestos, so shaped as to conform to the upper surface of the supportin member, A metallic reflector 15 is locate on the outside of the plate 14 and may have. its inner surface highly polished to reflect a large proportion of the heat radiated against it from the lower surface .of, the plate 10. A plurality of holes 16 are provided in the plate 10 which register with holes 17 provided in the reflector member 15, the plate 14 and the supporting member 13, to permit of locating.

therein a plurality of screw bolts 18 proextended flange vided with nuts 19 to suitably clamp the three members in proper operative positions relatively to each other.

A suitable control switch 21 is mounted on a plate 22 which may be secured against the member 13 by one of the screw bolts 18 to support the switch 21 from the member 13. A plurality of leads 23 extend from the switch 21 to suitable points on the plate 10, being secured thereagainst and to the resistor 12 by means of screw bolts 24 and nuts 24 to electrically connect the resistor to cuit conductorlnot shown) to permit of energizing the resistor to obtain various degrees of heat, in a manner well known in the art.

A hollow base 25 is provided with a lower ortion to be located on a supporting sur ace and an upwardly extending portion terminating in a horizontal top 26 in which is located a screw threaded opening 27. A screw threaded stud 28 has its uper end extending through and secured against the supporting member 13 by means above the nut. This construction permits ofvertically adjusting the assembled heating unit on the base 25 to cause the upper surface of the plate 10 to operatively engage, or be located closely adjacent to, the under surface of a coffee urn of acommercial type and'of securely looking it in such position. The device embodying my invention provides a heating unit having means for re-' fleeting heat which may be radiated from its lower surface and for reducing the flow of heat through said reflecting member to a supporting member and it provides also a heating unit which may be easily and quick -lyadjusted in a vertical direction.

Various modifications may be made in the device embodying my invention without departin from the s irit and scope thereof and I desire that on y such limitations shall be placed thereon as are imposed by the prior art or are specifically set forth in the appended claims.

I claim as my invention:

1, In an electric heater, in combination, a refractory member, a resistor located in said refractory member, a supporting means for said refractory member, means for reducing the flow of heat from said resistor to said supporting means, a base, and means for adjust-ably mounting said supporting means on said base.

2. In an electric heater, in combination, a heating element, a supporting means there for, means for reducing the flow of heat from said heating element to said supporting means, a switch for said heating element mounted on said su porting means, a base, and means for ad ustably mounting said heating element, supporting means and switch on said base.

3. In an electric heater, in combination, a heating element, a reflector beneath said element, a means for supporting said heating element and reflector, a. heatfiow reducing means interposed between said reflector and said supporting means, a base, and a vertically-adjustable means for mounting said supporting means on said base.

'f'ln an electric heater, in combination, a horizontally extending plane heating element, means beneath said element tor reflecting upwardly heat radiated against said means, a support for said reflecting means and said heating element, a heat-insulating means located between said reflecting means and said support, a base, and a vertically adjustable means for mounting said support on said base.

5. In an electric heater,- in combination, a horizontally extending plane heating element, a support therefor located beneath said element, heat-reflecting and heat-insulating means interposed between said element and said support, a switch for said heating element supported by said supporting means, a base, and a vertically adjustable means for mounting said support on said base.

In testimony whereof, I have hereunto subscribed my name this 15th day of Oct.

' JAMES C. WOODSON- 

